According to the Washington Post, Mamie Gummer and Benjamin Walker have tied the knot on July 16th. The actress (daughter of Meryl Streep) wed her actor boyfriend at the family’s estate wearing her grandmother’s gown for the lake-side ceremony with 150 guests (including Tracey Ullman, Laura Linney and Claire Danes), then changed into another dress for dinner. No further information from other sources, but in case it’s true – congratulations!